Possible Clues:

• Area of danger
• Fast waters
• Fast-flowing river stretches, white water
• Obstacle for canoeists paddling initially in storms
• Police beginning to wear rifles, they're sometimes shot
• White water rafting challenge with fast-track to The Point
• They may be shot close to camp in attacks
• Power in rifles, they're sometimes shot!
• Very fast-moving river current
• Frothy river parts